This document is the user manual of HW30 Heat Watch. It introduces the functions and operation methods of the device.
The Extech HW30 is a multi-function watch designed to monitor environmental conditions and time. It features a Heat Index mode that calculates temperature based on ambient readings and relative humidity, alongside standard chronograph capabilities including lap/split timing and countdown timers.
The device includes several operational modes such as Time/Date, Alarm, and Stopwatch with memory for up to 99 laps or splits. Users can set alarms for specific heat index levels and customize units of measure between Fahrenheit and Celsius.
| Accuracy (Watch) | +5 seconds/24 hours |
|---|---|
| Accuracy (RH) | +5% (33 to 75% RH), +7 %(1 to 32% and 76 to 99%) |
| Accuracy (Temp) | +3°F (1.5°C) |
| Temperature Range | 14 to 122°F (-10 to 50°C) |
| Heat Index Range | 70 to 122°F (22 to 50°C) |
| Humidity Range | 1 to 99%RH |
| Memory Capacity | 30 Laps/ 30 Splits |
| LAP Counter Max | 99 Laps |
| Battery Type | CR2032 |
| Dimensions | 3.1x2.6x0.8" (79x66x23mm) |
| Weight | 3 oz. (85g) with battery |
The temperature accuracy is +3°F or 1.5°C.
The device can store up to 99 laps and 30 split times.
It uses a Round Button cell Type CR2032.